/Engine/Source/Developer/Localization/Public/LocTextHelper.h
This requires that the given culture is in the list of foreign cultures set during construction.
True if the file was saved, false otherwise.
bool SaveForeignArchive ( const [FString](API\Runtime\Core\Containers\FString) & InCulture, const [FString](API\Runtime\Core\Containers\FString) & InArchiveFilePath, [FText](API\Runtime\Core\Internationalization\FText) * OutError ) const